wow my schooling as a manufacturing engineer is kicking in...

What about stopping after stripe color.

waiting until the night or next morning to tape. Give the strips a chance to really cure. or is that really not a consideration with catalyzed paint..
I would also think you want to have time to thoroughly clean the spray gun on the color change...
Then do an second AM session on Saturday for the main color. That way your not dead tired at the end of an already long day. and if you start color at the same time each day you should have similar temperature profile. consistency is a key here or so I think..

keep going and keep posting.
Chris AKA Gromit